Knee sleeve



FIG. 1 is a perspective view of a knee sleeve;

FIG. 2 is a side view of the knee sleeve;

FIG. 3 is a rear view of the knee sleeve;

FIG. 4 is a top view of the knee sleeve;

FIG. 5 is a bottom view of the knee sleeve; and,

FIG. 6 is a front view of the knee sleeve. 

The ornamental design for a knee sleeve, as shown and described. 